NavigationRouter: Remove reference to former retained view controllers when change the root module.Add navigation logs.
NavigationRouter: Remove reference to former retained view controllers when change the root module.Add navigation logs.

vector-im/vector-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/vector-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/vector-ios